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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CSSParserTokenRange_h
#define CSSParserTokenRange_h
#include "core/css/parser/CSSParserToken.h"
#include "wtf/Vector.h"
namespace blink {
extern const CSSParserToken& staticEOFToken;
// A CSSParserTokenRange is an iterator over a subrange of a vector of CSSParserTokens.
// Accessing outside of the range will return an endless stream of EOF tokens.
// This class refers to half-open intervals [first, last).
class CSSParserTokenRange {
public:
CSSParserTokenRange(const Vector<CSSParserToken>& vector)
: m_first(vector.begin())
, m_last(vector.end())
{
}
// This should be called on a range with tokens returned by that range.
CSSParserTokenRange makeSubRange(const CSSParserToken* first, const CSSParserToken* last);
bool atEnd() const { return m_first == m_last; }
const CSSParserToken* end() const { return m_last; }
const CSSParserToken& peek(unsigned offset = 0) const
{
if (m_first + offset >= m_last)
return staticEOFToken;
return *(m_first + offset);
}
const CSSParserToken& consume()
{
if (m_first == m_last)
return staticEOFToken;
return *m_first++;
}
const CSSParserToken& consumeIncludingComments()
{
const CSSParserToken& result = consume();
while (peek().type() == CommentToken)
++m_first;
return result;
}
const CSSParserToken& consumeIncludingWhitespaceAndComments()
{
const CSSParserToken& result = consume();
consumeWhitespaceAndComments();
return result;
}
// The returned range doesn't include the brackets
CSSParserTokenRange consumeBlock();
void consumeComponentValue();
void consumeWhitespaceAndComments();
static void initStaticEOFToken();
private:
CSSParserTokenRange(const CSSParserToken* first, const CSSParserToken* last)
: m_first(first)
, m_last(last)
{ }
const CSSParserToken* m_first;
const CSSParserToken* m_last;
};
} // namespace
#endif // CSSParserTokenRange_h
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